<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-alert title="添加商品信息" :closable="false" type="info" center show-icon></el-alert>
            <el-steps align-center :space="200" :active="activeIndex-0" finish-status="success">
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :rules="addFormRules" ref="addFormRef" :model="addForm" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClick">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item v-for="item in onlyTableData" :label="item.attr_name" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>    
                        </el-form-item>    
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action图片上传地址  -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane> 
                </el-tabs>
            </el-form>
        </el-card>
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="你要找的图片不存在了" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                goods_cat: [],
                pics: [],
                // 商品详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' } 
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表
            manyTableData: [],
            // 静态属性列表
            onlyTableData: [],
            // 上传图片地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传的请求头
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
           const { data: result } = await this.$http.get('categories')
           if(result.meta.status !== 200) return this.$message.error('获取分类数据失败！')
           this.catelist = result.data
        },
        handleChange() {
            if(this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        // 标签页切换
        beforeTabLeave(activeName, oldActiveName) {
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClick() {
            // 访问的是动态参数面板
            if(this.activeIndex === '1') {
                const { data: result } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
                if(result.meta.status !== 200) return this.$message.error('获取动态参数失败！')
                result.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = result.data
            }
            if(this.activeIndex === '2') {
                const { data: result } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
                if(result.meta.status !== 200) return this.$message.error('获取静态属性失败！')
                this.onlyTableData = result.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片操作
        handleRemove(file) {
            const filePath = file.response.data.tmp_path
            const index = this.addForm.pics.findIndex(x => x.pic === filePath)
            this.addForm.pics.splice(index, 1)
        },
        // 图片上传成功
        handleSuccess(response) {
            const picInfo = { pic: response.data.tmp_path }
            this.addForm.pics.push(picInfo)
        },
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return this.$message.error('请填写必要的表单项！')
                // 执行添加操作
                // loadash cloneDeep()深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = this.addForm.goods_cat.join(',')
                // 动态参数处理
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // 商品名称唯一
                const { data: result } = await this.$http.post('goods', form)
                if(result.meta.status !== 201) return this.$message.error('添加商品失败！')
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }    
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 5px 0 0;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>
